SPC is the abbreviation of Stone Plastic Composites. The main raw material is polyvinyl chloride resin. It is made by extruding machine combined with T-mold to extrude SPC substrate, using three or four roller calendering machine to heat and laminate PVC wear-resisting layer, PVC color film and SPC substrate respectively. The production process does not use glue at all.
SPC floor raw material:
PVC 50 KG
Calcium carbonate 150KG
Calcium zinc stabilizer 3.5-5KG
Grinding powder (calcium zinc) 50
Stearic acid 0.8
ACR 1.2
PE wax 0.6
CPE 3
Impact modifier 2.5
Carbon black 0.5
Key points of Recipe
1.PVC resin: Using ethylene method five type resin, strength toughness is better, environmental protection.
2. Fineness of calcium powder: Because the addition proportion is large, it directly affects the cost of the formula, the machining performance and the wear and tear of the screw barrel and the product performance, so the coarse calcium powder can not be selected, and the fineness of calcium powder is beneficial to 400-800 mesh.
3. Internal and external lubrication: Considering the material in the extruder high temperature residence time is long, as well as material performance and stripping force factors, it is recommended to use high-performance wax to control the smaller amount of use, and the use of different wax to meet the initial and medium – and long-term lubrication requirements.
4.ACR: Due to the high content of calcium powder in SPC floor, plasticizing requirements are high. In addition to the control of screw type and processing technology, additives must be added to help plasticizing, and ensure that the melt has a certain strength, and has a certain ductility in the calendering process.
5. Toughening agent: The floor not only needs low shrinkage rate, good rigidity, but also needs a certain toughness, rigidity and toughness need to balance each other, to ensure the firmness of the lock, not soft at high temperature, and maintain a certain toughness at low temperature. The toughness of CPE is good, but the addition of large number of copies reduces the rigidity of PVC, the softening temperature of Vica, and leads to a larger shrinkage rate.
6. Anti shrinkage agent: compress the particle gap between PVC materials to reduce the shrinkage caused by temperature
7, PE wax is not only a lubricant, and has a dispersion effect, but the amount of general influence of internal and external lubrication balance and melt strength change and increase the shrinkage of products and reduce the stripping force, products become brittle.
8. Recycling: try to use the company’s production recycling and post-processing recycling materials.
Note: Clean, not wet, batch crushing mix after grinding. In particular, the recycled material of the cut groove must be mixed with the grinding powder in proportion to form a closed return material cycle. It is necessary to adjust the process formula of the sample when the amount of refeeding changes greatly. The production process does not use glue at all.
Post time: Nov-09-2022